1. Disinfection and sterilization
Principle: Calcium hypochlorite dissolves in water to form hypochlorous acid (HClO), which decomposes to produce new ecological oxygen ([O]). It has strong oxidizing properties and can destroy the protein structure of bacteria and viruses, rendering them inactive.
Application Scenario:
Disinfection of drinking water: widely used for disinfection of water plants, swimming pools, rural well water, etc., effectively killing pathogens such as Escherichia coli and Vibrio cholerae.
Environmental disinfection: used for disinfection of floors and equipment in hospitals, schools, and public places to prevent the spread of infectious diseases.

Food processing: Disinfect fruits, vegetables, tableware, and production equipment to extend their shelf life.

2. Bleach effect
Principle: The strong oxidative properties of calcium hypochlorite decompose the chromophores of colored substances, causing them to fade.
Application Scenario:
Textile industry: used for bleaching natural fibers such as cotton, linen, and silk to improve fabric whiteness.
Paper industry: used as a pulp bleaching agent to remove colored impurities such as lignin.

Daily chemical products: manufacturing bleach powder and bleach solution, used for clothing and household cleaning.

3. Water treatment
Principle: Remove organic matter, heavy metal ions, and odors from water through oxidation, while killing algae.
Application Scenario:
Industrial wastewater treatment: Treating wastewater from industries such as printing and dyeing, papermaking, and chemical engineering to reduce COD (Chemical Oxygen Demand) and BOD (Biochemical Oxygen Demand).
Swimming pool water purification: Regularly add calcium hypochlorite to maintain clear water quality and prevent algae growth.

Cooling water system: inhibits microbial growth, prevents equipment corrosion and scaling.

4. Agricultural applications
Principle: The oxidizing property of calcium hypochlorite can destroy pathogenic bacteria and pest eggs in soil, while regulating soil pH.
Application Scenario:
Soil disinfection: used for soil treatment in greenhouses and seedbeds to prevent soil borne diseases.
Seed disinfection: Soaking seeds kills surface bacteria and increases germination rate.

Livestock and poultry breeding: Disinfect the environment and drinking water of the breeding farm to prevent animal diseases.

5. Chemical raw materials
Usage: Calcium hypochlorite is a raw material for the synthesis of other chlorinated compounds, such as sodium hypochlorite and chlorine gas, and can also be used to prepare organic chlorinated compounds.
Precautions
Safety: Calcium hypochlorite is corrosive and may cause irritation upon contact with skin or inhalation of dust. Protective equipment should be worn during operation.
Stability: It is prone to moisture and decomposition, and should be sealed and stored in a dry, cool place to avoid mixing with acidic substances.
Environmental friendliness: Excessive use may lead to excessive residual chlorine in water bodies, and strict control of usage and monitoring of water quality are necessary.
Comparison with other disinfectants
Compared to sodium hypochlorite (84 disinfectant), calcium hypochlorite is more stable and suitable for long-term storage; Sodium hypochlorite has higher activity, but is prone to decomposition.
Compared to chlorine gas: Calcium hypochlorite is safer to use and does not require on-site chlorine production, but the cost is slightly higher.
Calcium hypochlorite has become a commonly used chemical in the fields of disinfection, bleaching, and water treatment due to its high efficiency, broad spectrum, and low cost. However, it needs to be used in a standardized manner to ensure safety and environmental protection.